Turbo whistle
 

Hello, everybody.
Im new here and i hope i post where i should.
I ve got a x5 e70 non lci, 30d 2010. I got a turbo whistle between 1500-2000 rpm and i dont know why...the engine pulls good, the sound is louder when cold, but it is not gone when fully warmed. Also, i had the swirl flaps blanked and the vacuum hose is blanked with a screw.
Can you help me, please ? Im tired of this noise... drives me mad.


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I have a similar symptom, but would describe it as a squeal under load, common when cold, less so when warmed up. Was thus far assuming bearings, & I needed to look for an oil leak?

I assume u can look for an oil leak. i dont have any leaks


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all your seals good?

As i could see with the bonnet opened, i m no mechanic so i couldnt do an advanced search. Btw, can the vacuum control hose for the swirl flaps to be involved in this ?


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For mine, I didn't see anything obvious, but need to perform an exploratory. There was gunk in the general area, but 127kmi & not real accessible.

Surprised to not find much searching for this? Maybe not using the correct bimmer turbo terms?

I thought the same. I dont find much information about this problem...


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Is it a siren sound or a whistle? A search on siren brings up lots of discussions.


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Turbo whistle
 

https://youtu.be/Qdrq1CSpJUk

I searched on youtube, it sounds like this. Between 1200-2000 rpm to be very very exact and under easy throttle.
If i push the throttle gently it whistles, but when i push it harder the whistle disappears and when i release it, it whistles again until idle.


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That's more of a whine, not whistle.
Also, are you sure it is from the turbo?

To me it sounds like a noise a bad bearing would make. Idler pulley maybe?

Pop the boot/hood, have someone rev and listen what area it is coming from.